Valve-grinder



F. O. ALBERTSON.

v 'ALvEmNmsRl APPLICATION FILED OCT. 13| I920.

Patented Aug. 2, 1921.

2 SHEETS-SHEET I- M C @M2M /Iaa/af j? )wie 7W/a F. 0. ALBERTSON.

VALVE GRINDER.

APPLICATION FILED ocr. I3. 1920.

Patented Aug. 2, 1921.

2 SHEETS-SHEET 2.

jy ,mdlz #Ww UNITED STATES PATENT OFFICE.

FRANS O. ALBERTSON, OF SIOUX CITY, IOWA, ASSIGNOR TO ALBERTSON &COMPANY, OF SIOUX CITY, IOW'A, A CORPORATION OF IOWA.

VALVE-GRINDER.

Specification of Letters Patent.

Patented Aug. 2, 1921.

Application filed October 13, 1920. Serial No. 416,625.

To all wie om` z may concern Be it known that l, FinxNs 0. ALBERTSON, acitizen of the United States, residing at Sioux City, in the county ofWoodbury and State of Iowa, have invented a certain new and usefulimprovement in Valve- Grinders, of which the following is a full, clear,concise, and exact description, reference being had to the accompanyingdrawings, forming a part of this specification.

My invention relates to devices for grinding or refacing valves, andparticularly valves of the puppet type commonly eniployed in internalcombustion engines.

In this application, l disclose a device embodying the general featuresof construction and operation set forth in Letters Patent No. 1,282,018,granted to me on October 1918.

The objects of my present invention are 1st. To provide simple ande'liicient means for grinding or refacing valves;

2nd. To provide a power-driven valve grinder;

3rd. To provide a Yportable power-driven valve grinder;

4th. To provide a valve grinder adapted to be driven by a. portablepower unit, the portable power unit having means for detachably engagingand rotating the driving member of said valve grinder;

5th. To provide a valve grinder having a driving shaft adapted to bedetachably engaged by portable power units comprising chucks ofdifferent capacities; and

6th. To provide a valve grinder adapted to be detachably engaged by aportable power unit, a driving shaft anda driven shaft of said valvegrinder having coincident axes, so that the combined weight of the valvegrinder and power means may be transmitted to the valve in a straightline coincident with the axis of the stem of said valve.

These and other objects of my invention will appear as this descriptionprogresses, reference being had to the accompanying drawings, wherein-Figure 1 is a side elevation of my iniproved valve grinder in operativeassociation with a valve and a portable power unit;

Fig. 2 is aY sectional view t'alren on line 2-2 of Fig. 1, looking inthe direction of the arrows 5 Fig. 3 is a side elevation of my improvedvalve grinder, the cover plate being removed and a portion of thegrinder shown in section, for the purpose of more clearly illustratingthe features of my invention.

Similar characters of reference indicate similar parts throughout theseveral views.

In Fig. 1 l have shown my improved valve grinder at A, a portable powerunit at l, and a conventional type of internal combustion enginecylinder at C. The wall of cylinder C is broken away to disclose theusual exhaust valve D seating in the beveled seat F. A valve stem guideG is provided for the valve stem F. rlhe intake valve and its seat havebeen removed to permit access to the exhaust valve D.

Vhile the particular details ot the portable means eniployed to operatemy improved valve grinder do not form a part of my invention, lpreferably employ and have illustrated a conventional type of portabledrill comprising an electric motor carried in a housing 6, the housing 6having a handle "Z, whereby the operator may hold the portable drill inany desired position. Energy is supplied to the motor by a iiexiblecable S. A shaft carrying a chuck member 9 is journaled in the housing 6and is driven at a reduced speed by said motor.

As illustrated in the drawings, the improved valve grinder comprises acasing 10 provided with a cover plate 11, said cover plate 11 being'secured to the casing 10 by machine screws 12. Fixed to the casing 10 isa handle 1lL of suitable design. A boss 15 extending upwardly from theupper end of the casing 10 has a central bore 16. The bore 16 isprovided with a bushing 17 to journal a driving shaft 18. A ball thrustbearing 19 is tted into an enlarged portion 2O of the bore 16 andco-acts with a thrust collar 21 of the shaft 18. The outer end of theshaft 1S is turned to a plurality of diameters, as at 22 and 23, wherebythe shaft I 1S may be operatively engaged by portable power units havingchucks of different capacities. 'The inner end of the shaft 18 isthreaded to receive a nut 24, which prevents longitudinal displacementof a spur gear 25 rigidly secured to said shaft 18.

The casing 10 is provided with combined radial and thrust bearings 26and 27 to jour-- nal the upper and lower ends, respectively.4

of a worm shaft 28, the worm shaft 28 hav ing its axis parallel to theaxis of the driving shaft 18. The bearing 27 is adjustably secured inthe casing 10 and may be locked in an adjusted position by means of aset screw 30. A spur gear 3l is rigidly secured to the worm shaft 28 andmeshes with the spur gear worm 32 formed integral with the worm shaft 28is disposed intermediate the spur gear 31 and the bearing 27.

A shaft 33 is disposed at right angles to the driving shaft 18. @ne endof the shaft 33 is journaled in the cover plate 11, and the other end ina socket 34 in the casing `10. lligidly secured to the shaft 33 is acollar having fixed thereto a pair of mutilated gears 36 and 37. 1n thepreferred form of my invention. the gears 3G and 37 are mutilated sothat one of the gears has more teeth than the other. Fig. 3 shows thegear 38 as being provided with nine teeth and gear 37 with six teeth. Agear 38 is rigidly secured to the collar 35 intermediate the mutilatedgears 36 and 37--and meshes with the worm 32. Mounted around theV shaftand interposed between the cover plate 11 and the mutilated gear 36 is acoiled compression spring 39. The spring 39, as shown in Fig. 2, servesto yieldingly force the right hand end of the shaft 33 into the socket34. A, boss 40 extending outwardly from the lower end of the casing 10is provided with a bushing 40a and journals a driven shaft 41. Theaxesof the driving shaft 18 and the driven shaft 41 l are coincident for apurpose which will presently appear. A. spur gear 42 is rigidly securedto the inner end of the shaft 41 and meshes with both gears 36 and 37.Interposed between the spur gear 42 and casing 10 is a coiledcompression spring 43, tending to move the shaft 41 inwardly. The lowerend of the shaft 41 has threaded upon it a ball race member 44 having aco-acting ball race member 45, the ball race member 45 resting againstthe outer end of the boss 40. Bearing balls 46 are interposed betweenthe ball race members 44 and 45. A Vshaft 47 is threaded into anextension 48 of the ball race member 44, and has pivotally secured toit, at its lower end, a valve-engaging piece 49. This valve-engagingpiece 49 is arranged to it into the slot usually provided in puppetvalves, so that oscillation of the driven shaft 41 may be transmitted tothe valve to be re-ground or ire-faced.

1n the operation of the device, the operator holds the portable powerunit B and valve grinder' A in operative association with the valve D.by means of the handles 7 and 14. The outer end of the shaft 18 isdetachably engaged by the chuck 9 of the portable power unit B andcaused to rotate in the direction indicated by the arrow X. (Fig. rlhespur gears 25 and 31, to-

gether with the worm 32 and gear 38, transmit the rotary motion of theshaft 18 to the shaft 33, thereby causing the mutilated gears 36 and 37to rotate in a clockwise direction. (Fig. 3.) The leading teeth 51 and52 of the mutilated gears 36 and 37, respectively, are each bentoutwardly in a direction away from the lother mutilated gear, asdescribed in the above mentioned patent, the mutilated gea-rs 36 and 37imparting a progressively advancing oscillatory motion to the drivenshaft 41 by means of the successive engagement of the gears 36 and withthe spur gear 42.

The driving shaft 18 and driven shaft 41 and the portable drill shaft,which carries the chuck memberl 9, have coincident axes. Thisarrangement facilitates the grinding operation, and the portable drill77and valve grinder are easily balanced and held. in a proper positionrelatively to the work. The weight of the valve grinder andv its driving`means is transmitted in a straight line, substantially coincident withthe axis of the valve stem, thus preventing undesirable unequal grindingupon diiferent portions of the valve seat. Y

1 have illustrated a coiled compression spring 53 interposed between thevalve l) and the valve stem guide G. This spring. 53 is adapted to raisethe valve D from its seat F when the weight of the valve grinder is notimposed upon said valve D.

While 1 have described the details iof a preferred form of my invention,itis to be understood that my invention is not limited to these details,except by the scope of the appended claims.

Having thus described my invention, what 1 claim as new and desire tosecure by Letters Patent of the United States, is: Y

1. A valve grinder comprising a driving shaft adapted to be engaged androtated by a chuck, a casing, a removable cover plate for said casing,Va spur gear rigidly secured to said driving shaft, a worm shaftdisposed parallel to said driving shaft, a second spur gear rigidlysecured to said worm shaft and meshing' with said first-mentioned spurgear, a worm formed integral with said worm shaft, a third shaftdisposed at right angles to said worm shaft, said third shaft beingjournaled in said cover plate and a socket in said casing, spring meansfor holding said third shaft in said socket, a pair ofmuti- 12.0

vlated gears rigidly secured to said third shaft, the leading tooth ofeach mutilated shaft, bearing balls between said collar and casing onthe inner side of said collar and the outer side of said casing, springmeans for maintaining engagement between said collar and bearing balls,and a spur gear rigidly secured to said driven shaft and meshing withsaid mutilated gears.

2. A valve grinder comprising a driving shaft, a spur gear rigidlysecured to said driving shaft, a worm shaft, a second spur gear rigidlysecured to said worm shaft and meshing with the first-mentioned spurgear, a worm carried and rotated by said worm shaft, a third shaft, apair of mutilated gears rigidly secured to said third shaft, a gearrigidly secured intermediate said mutilated gears to said third shaftand meshing with said worm, a driven shaft, and means intermediate themutilated gears and the driven shaft whereby the driven shaft may beactuated alternately by the mutilated gears.

3. A valve grinder comprising a casing, a vertically disposed drivingshaft extending into said casing at the top thereof, and provided on itslower end with a spur gear, a bearino carried by the casing adapted toreceive tie downward thrust of said driving shaft, a vertically disposeddriven shaft extending into said casing at the bottom thereof, andprovided at its upper end with a spur gear, a bearing carried by thecasing adapted to receive the upward thrust on said driven shaft, anddevices within the casing which are actuated by continuous rotarymovement of the upper spur gear and which impart oscillatory movement tothe lower spur gear.

In witness whereof I hereunto subscribe my name this 8 day of October,1920.

FRANS O. ALBERTSON. Witnesses B. V. DUMAN, H. A. JAooBsEN.

